Also in 2006, West Fertilizer had a complaint filed against it for a lingering smell of ammonia, the Texas Commission on Environmental Quality website shows.
Separately, the plant had informed the Environmental Protection Agency that it presented no risk of fire or explosion, according to The Dallas Morning News. It did so in 2011 in an emergency planning report required of facilities that use toxic or hazardous chemicals.
The plant's report to the EPA said even a worst-case scenario wouldn't be that dire: There would be a 10-minute release of ammonia gas that wouldn't kill or injure anyone, the newspaper reported.
What happened Wednesday night was much worse.